165652397 has 4 divisors (see below), whose sum is σ = 165681660. Its totient is φ = 165623136.

The previous prime is 165652381. The next prime is 165652411. The reversal of 165652397 is 793256561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91795561 + 73856836 = 9581^2 + 8594^2 .

It is a cyclic number.

It is not a de Polignac number, because 165652397 - 2⁴ = 165652381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165652307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3122 + ... + 18467.

It is an arithmetic number, because the mean of its divisors is an integer number (41420415).

Almost surely, 2^165652397 is an apocalyptic number.

It is an amenable number.

165652397 is a deficient number, since it is larger than the sum of its proper divisors (29263).

165652397 is an equidigital number, since it uses as much as digits as its factorization.

165652397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29262.

The product of its digits is 340200, while the sum is 44.

The square root of 165652397 is about 12870.6020449705. The cubic root of 165652397 is about 549.2025876887.

The spelling of 165652397 in words is "one hundred sixty-five million, six hundred fifty-two thousand, three hundred ninety-seven".